I need a Google Accounts expert!

I have a tangle of personal and business google accounts, and I need an expert to help me understand them and clean things up.

1. Explain to me how google accounts work, what their purpose is, and how best to use them.

2. Help me disentangle my accounts, reactivating them and recovering passwords where necessary.

3. Close non-essential accounts, and if appropriate, open a new, simplified and streamlined account.